Gravitational waves in ghost free bimetric gravity

2012/11/14 by Morteza Mohseni
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Pulsars and Gravitational Waves Research #hep-th

paper · pdf · doi:10.1088/1475-7516/2012/11/023

published as JCAP11(2012)023

openalex publication_date 2012/11/14 · arxiv created 2012/11/15 · arxiv updated 2012/11/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

We obtain a set of exact gravitational wave solutions for the ghost free bimetric theory of gravity. With a flat reference metric, the theory admits the vacuum Brinkmann plane wave solution for suitable choices of the coefficients of different terms in the interaction potential. An exact gravitational wave solution corresponding to a massive scalar mode is also admitted for arbitrary choice of the coefficients with the reference metric being proportional to the spacetime metric. The proportionality factor and the speed of the wave are calculated in terms of the parameters of the theory. We also show that a F ( R ) extension of the theory admits similar solutions but in general is plagued with ghost instabilities.

Citations

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